Closure fastener operator



C. H. DE WERTH CLOSURE FASTENER OPERA'IQR Feb. 28, 1933.

2 Sheets-Sheet 1 Filed llarch 16, 1932 I lnycnlor Charles H De Werih Patented Feb. 28, 1933 UNITED STATES.

mama HAROLD DE WEB'I'H, OI BRONX, NEW YORK cLosunn-nsrmnn or'mron Application fled nun 1a, 1932. Serial no. mass. Q

This invention appertains to newand useful improvements in closure fasteners, and

Fig. 2 represents a vertical sectional view .through the fastener showing the same in fastened position.

Fig. 3 represents a vertical sectional'view through the fastener showing the fastener in unfastened position.

Fig. 4 represents a perspective view of the keeper.

Fig. 5 represents a diagrammatic view disclosing the electrical connection between the electrical devices involved.

Referring to the drawings wherein like numerals designate like parts, it can be seen that numeral 5 represents the shaft of a dumb waiter, numeral 6 representing the dumb waiter elevator bulb operative therein.

Numeral 7 generally refers to the fastener, while numeral 8 denotes the closure of which may be any number and it is also to be understood, that the dumb waiter 6 may serve more than one apartment or suite of rooms on a given floor, in which instance, all of the closures 8 afiordin communication or access to the particular umb waiter on the same floor can be operated simultaneously. (See Fig. 5).

sis apparent in Figs. 1 to 3 inclusive, the keeper (see Fig. 4) generall referred to by numeral 9 includes a plate 10 v aving openings 11 therein through which fastening means can be disposed for securing the plate to the 1 closure 8. Extending from this late 10 is the shank 12 having an upstanding ead 13 at its outer end. This head 13 has a beveled portion 14 on the outer end thereof.

The fastener proper denoted by numeral 15 inFi 2 and 3 includes a casing 16 and a remova le closure 17 (see Fig. 1). I The securing element consists of an arm 18 havin a depending head 19 at its free end, and a epending eg 20. at its pivoted end which merges into an inwardly diver ed extension 21. This extension 21 is provided with an inwardly dis osed formation 22 thereon having a bevele portion 23 whichis normally in the path of the beveled portion 14 of the head 13 on the keeper generally referred to by numeral 9.

Numeral 24 represents an electromagnet with which the swingabl'e armature 25 is asso-v ciated. This armature 25 is a boss 26 thereon and is connected to the di-electric block 27 by the leaf spring 28.

As is clearly shown in Fig. 5, numeral 29 represents a suitable source of ener ,such

as a battery or the like on one side 0 which extendsa lead 30 to the switcharm 31. Extending) from contact 32 located ad'acent the switch lads, and with which the switch blade is selectively en ageable on the conductors 33, each of whic extends to one side of an electro-magnet 24.

If there are more than one of the electromagnetic fasteners on each floor of the building, these can extend from the conductors 33 to the several electromagnets. Numeral 35 represents the negative side of the system and branches 36 can extend therefrom on different floors of a building, to connect to the negative sides of the electro-magnets 24.

It can now be seen, that normally, the head of the arm 18 is engaged with the head 13 of the keeper 9. The spring 28 of the armature 25 maintains the armature 25 elevated so that the boss 26 will be in advance of the extension 21. This is against the tension of the spring 36 which is convoluted about the pivot pin 37 of the arm 18.

It can now be seen, that when the electromagnet 24 is energized by actuating the switch blade 31 through engagement of the contacts 32 (this being performed by the janitor or other house servant) the armature 25 s neeaau will be attracted, resulting in the release of the arm 18. The spring 36 will now swing the arm upwardly and as this occurs, the beveled portion 23 of the formation 22 will 5 ride against the beveled portion 14 of the head 13 on the keeper l9 and 1n so doin will exert pressure suflicient to automatical y open the closure 8.

Obviously, when the closure is again closed 10 the beveled portion 14 will wipe against the beveled ortion 23 on the formation 22 with the resu t that the diverged extension 21 will be swung backwardly to engage behind the force 26 on the armature 25, the electro- 1 ma et 24 now being de-energized.

ile the foregoing specification sets forth the invention in speci 0 terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having thus described my invention, what I claim as new is A fastener operator comprising a 'keeper 25 having an upstanding hea beveled on its outer side, a swingable arm having a depending head, a projection underlying the head on the arm, said projection being provided with a beveled portion on the same plane with the bevel of the keeper head, and located inwardly of the innermost side of the head of the arm, and a sprin for normally maintaining the arm urge to a position maintaining the projection with its beveled ortion o posed to as the beveled portion of the head of the keeper and in the path of the keeper.

In testimony whereof I aflix m si ature. CHARLES HAROLD DE MTH. 

